Roller grizzly



June 24, 1930. M A, KE-NDALL 1,766,340

ROLLER GR I Z ZLY Filed March 20, 1929 2 Sheets-Sheet l June 24, l M. A. KENDALL 1,766,340

ROLLER GRIZZLY Filed March 20, 1929y 2 Sheets-Sheet 2 I @Pon/q? f "'Zy Mm( WMM a Patented June 24, 1930 UNITED... STATES rATE-Nr -ricls'.

MYRON n. KnNnnLL,V on annoiata, ILLINOIS, AssIGNon- To s'rnrHnNsfAnAMSoN MFG.

co., n` CORPORATION on ILLINOIS.

nomen GRIZZLY.

Application filed March 29, 1929. SeralNo. 348,483.

'lhis invention relates to. devices for screening coal, ore and the like material.

The` principal obj-ect of the invention. is: the provision ofV a screening device that is provided with means for automaticallyy maintainingthe. openings in the, screening bed in operative condition byremoving the material that is not large. enough to ride down the. screen overthef openings: and that is too large. to pass through the. openings.

i theA screen bed.

A further object ofi the invention is the. provision ot means for rapidly moving the material over the screen bed: and at the same. time elicient-ly removing material upl to a predetermined size.

A stii'l further object of' the invention is the. provision. oi` a screening.I device that is.

cheap to manufacture, easily assembled, efcientin. Operation7 and that is.. adapted to autonmticallly. remove trom the openings. any.- material that tends to. lodge therein.

Other and; further obj ec-ts and: advantages of theV invention vvilil appear rom the. following description taken in connection with the accompanying drawings, in which Fig. 1 isa plan. view ofthe. device.;

2= is a section on line 2^.-:2l o-ii Eig. it;

Fig. 3 is a section on line` of Fig. 1-;

Lltshovvs one ot the. rollers oii a modiied form oii the. device Fig. 5. shovvs one ofthe. rollers off a.- urther modified. form ot. construction ;A and Fig. 6 shows one cnthel rollers.y of: an still furthermodiiied form oitA the-` device.

provided with a plurality rot' individual grooves extending about therOller-s. These.

rollers. are so arranged that the. grooves in roller. Ign screening certain kinds ot' ma: terial such, for instance, as.oI;e.or-hard1 coala or other material that is hard and does not crumble easily5` the.. slightly; oversize. lumps become. lodged; in the. grooves. formingethe Openings because they are, too large to passA through the openings and are too. small to. extend from roller to roller toK ride over the openings,v and as a result the openings in a short time vvill become closed With lumps of the slightly oversize material.

The present invention seeksto. remedy this dfiiiiculfty byv providing means for automatically removing this slightly oversize material from the openings discharging it from the screen.A

Referring now to. the drawings, the ref. erence numeral l0 designates the screening device known in the art as a grizzly. 'lihis` device comprises, the inclined frame me1n. bers 11 and 12 Within. which isl journaled a plurality of rollers 13.

In the `form` oil the. device. selected to illustrate one embodiment of the invention., as shown in. Fig. 1, these rollers; are all.= oli the Same diameter and are adapted tov be mounted inthe frame adjacent to eachv other. Flach. roller is provided with right, and lef-t spiral grooves 14:` and 'L5 andthe grooves of adjacent rollers are arranged oppositeeach other` so as to form` screen. openings 116 through whichL the material to be. screened is adapted to pass. Extending about the/central portion oteach roller' is a circular iiange or coll-ar 17'- vvhich dilvid'es the tvvo spiral grooves `from each. other.

Suitable means` are provided; for rotating the rollers, in. the. same direction. They are so. rotated that their upper surface vvillf travel in a direction to cause the larger ma,- terial tol travel dovvnfthe grizzly. Anysuitable means may be employedl for that purpose. As. shown, a. pair of sprockets L8,

19 are mounted on one or both ends of the In the construction ot screening devices.

or? the type known as theA grizzly7V rollers.- are mined by; thesizethat it is desired to. malte,

the openings. In the form disclosedg' the Vopenings are of-uniiorm diameterfthnoughr.

out the grizzly, but they may be otherwise if so desired.

The grooves may be so arranged that the material lodging in any of the openings will be conveyed toward any desired point on the grizzly. In the form shown in Fig. l the grooves are so arranged that the material lodged in the openings will be conveyed toward the outer ends of the rollers. In order to dislodge the materialv from the openings the grooves at each end of the rollers gradually decrease in depth. By means of this arrangement the material that is conveyed to the shallower portions of thegroove will be elevated onto the periphery of the rollers. Preferably the groove terminates at a point 2O spaced from the sides 24 and 25 to provide spaces 26 and 27 on the smooth portion of the rollers for receiving the material conveyed laterally by the rollers. After this material is vconveyed to the spaces 26 and 27 it will be conveyed down the grizzly along with the material that is too large to enter the grooves.

In the operation of the device, the material will be delivered to the upper roller over the guide 28 and will pass downwardly over the grizzly, the smaller portions falling through the openings 16 and the particles that are too large to enter the grooves will be conveyed by the rotating rollers down the grizzly.

Certain of the particles that are too large to pass through the openings and not large jenough to extend across the grooves from roller to roller are likely to become lodged in the openings. In this' event, the spiral grooves will convey these particles toward the sides of the grizzly and they will be elevated to the surface of the rollers by the camming action of the outer ends of the grooves due to their gradual decrease in depth.

From an inspection of Fig. l, it will be seen that at each rotation of the intermediate rollers a new set of openings is provided at each side thereof. 0r from another point of view, the openings may be considered as traveling outwardly from the rib 17 during the operation of the device. The formation of these new openings will tend to keep the grizzly clean and operating at its maximum elliciency.

The form of construction shownvin Fig. l

is by way of example only. The grooves on the rollers may be arranged to conduct the material that lodges in the openings in either direction or in both directions, or partly in one direction `and partly in another. rIhe rollers are shown as extending transversely of the frame, but it is understood that they may be arranged in other directions. In Fig. 4 is shown a modified form of roller 28 in which the groove 29 is continuous throughout its length whereby the material that lodges in the openings will all be couveyed to one side only of the grizzly.

In Fig. 5 is shown a roller 30 having a plurality of sections of right and left spiral grooves 3l, 32, 33 and 34 whereby a portion of the material lodging in the openings will be conveyed to the sides' of the grizzly, and a portion toward the center line thereof.

The grooves in the rollers may be of any` desired form in cross-section, thoseshown in Figs. l to 5 are curved, but it is understood that this is by Way of example only. If desired, the grooves may be of gradually increasing depth-from one end or portion to the other.

In Fig. 6 is shown a further modified form of roller 35 in which the right and left spiral grooves 36 and 37 are rectangular in crosssection. Each of these grooves gradually increases in depth from one end to a point adjacent to the other end of the groove and then rapidly decreases in depth as shown at 38, until it merges into the periphery 39 of the roller at each end thereof. By means of this arrangement, particles lodging in the openings adjacent to the central portion of the roller will be conveyed laterally toward larger openings until they drop through or are liftedto the surface of the rollers by the cam action of the gradually decreasing depth of the vportion 38 of the groove.

r In all forms of the construction, the rollers are preferably rotated at the same rate of speed sothat the grooves of one roller will cooperate with those of an adjacent roller to form openings. The size of these openings will vary to accommodate the work deably so arranged that it passes from a full r depth groove to a point where it merges into the surface of the roller in one turn about the roller.

Only one section of the grizzly is shown on the drawings. It is understood, however, that, as is usual in grizzly installations, a series of such sections may be used. The grooves in the first of such sections are deep, providing large openings, while those in succeeding sections are each shallower than in the section preceding. The material is thus graded by a battery of such sections.

While I have shown and described the invention as applied to a screen of the grizzly type, it is understood that this is by way of example only and that the invention in its broader aspect contemplates the provision of means for automatically removing material that may become lodged in the openings of the screen during its operation without moving or agitating the screen bed as a unit.

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of my device Will be apparent to those skilled in the art, and that various changes in size, shape, proportion and details of construction may be made Without departing from the spirit and scope of the appended claims.

I claim as my invention:

l. In a screen, a frame, a plurality of rollers journaled in said frame, said rollers being provided With spiral grooves, the turn of said grooves adjacent each end of said roller shallowing until they merge With the lperiphery thereof, the grooves of one roller cooperating with the grooves of an adjacent roller to form screen openings, and means :tor rotating said rollers whereby material lodged in said groove may be forcibly ejected.

2. In a screen, a frame, a plurality of rollers journaled on said frame, said rollers having spiral grooves thereon, each groove extending in opposite directions from the center thereof, the turn adjacent each end of said roller gradually decreasing' in depth at one end thereof, and means for rotating said rollers.

3. A grizzly comprising a Jframe, a plurality of rollers journaled in said frame, each roller having a spiral groove in its periphery extending in either direction from the center thereof, means for rotating said rollers in the same direction, and means including one shallovving turn of such spiral groove for ejecting material from said groove.

4. In a screen, an inclined frame, a plurality of rollers extending transversely to said frame and having their peripheries parallel and adjacent to each other, spiral grooves of substantially the same pitch extending about said rollers extending in opposite directions from the center thereof, the groove of one roller being arranged opposite to and cooperating with the grooves of adjacent rollers to form screen openings,

means for rotating said rollers in the saine direction and at the same speed, and means including a cylindrical section of Athe roller providing a path along which material rejected by the rollers may travel.

5. In a screen device, an inclined frame, a plurality of rollers in said frame extending transversely thereof, each roller being provided With a right and left groove, one turn of each groove gradually decreasing in depth and inally merging into the peripheral surface of the roller, and means for rotating said rollers in the same direction and at the same speed and in a direction to convey material riding over the same to Ward the bottom of the screen.

6. In a screening device, an inclined frame, a side member at each side of said frame, a plurality of rollers mounted in said t frame, said rollers extending transversely of said frame in parallel relation and yadjacent to each other, each of said rollers being provided With a plurality of alternating uright and left spiral groove sections terminating in a shallow turn and in spacedrelation V:Eromfsaid side members, and means for rotating said rollers. l

7. In a screening, device, a frame, apinrality of rollers journaled in said frame, each roller being provided With a right and left spiral groove, a circular collar on said roller for separating said grooves, the ends of said grooves opposite said collar decreasing in depths and merging into the surface of said roller whereby the grooves of adjacent rollers vvill cooperate to form openings through said screen of different diameters.

8. In a grizzly, an inclined frame, a plurality of rollers in said frame, each roller being provided with a spiral groove extending about the same and terminating in a portion of gradually decreasing depth and merging in the periphery of said roller at a point adjacent to but spaced from the side of said screen, and means for rotating all oi said rollers at the same rate of speed and in a direction to assist the material passing over said rollers in its descent along said screen.

9. In a grizzly, a frame, a plurality of grooved rollers mounted in said frame, the grooves of one roller cooperating With the grooves of an adjacent roller for forming screen openings, vvedging means for automaticallyremoving material becoming lodged in said openings, and means includ? ing an uninterrupted path along Which the material thus ejected may travel.

10. In a screening device, a stationary frame, a screen bed having openings therein, means 'for supporting said screen bed on said frame and preventing said bed from moving longitudinally, laterally or vertically relative to said frame, rotative Wedging means for automatically removing material that may become lodged in said openings during the operation of said screen, and means including an unobstructed path along which the material thus ejected may travel Without mixing With the material to be sized.

11. In a screening device, a series of rollers, channels in said rollers cooperating to form screen openings, said channels comprising in part a shallovved section ultimately merging in the periphery of said roller, means for causing the coordinated rotation of said rollers whereby by the cooperation of tvvo said shallovved sections oversize material may be ejected from the screen openings.

12. In a screening device, a frame, a plurality of rollers rotatably mounted on said frame, each roller being provided with a spiral groove for cooperating With a groove of an adjacent roller to form openihgs through said screen, a cylindrical section on said roller, a shallowing end turn of said groove immediately adjacent said cylindrical section, said cylindrical section forming a path down which rejected oversizematerial may travel.

In testimony whereof I aiiX my signature.

MYRON A. KENDALL. 

